/src/ffmpeg/libavformat/avs2dec.c
Line | Count | Source |
1 | | /* |
2 | | * AVS2 video stream probe. |
3 | | * |
4 | | * Copyright (C) 2018 Huiwen Ren, <hwrenx@126.com> |
5 | | * |
6 | | * This file is part of FFmpeg. |
7 | | * |
8 | | * FFmpeg is free software; you can redistribute it and/or |
9 | | * modify it under the terms of the GNU Lesser General Public |
10 | | * License as published by the Free Software Foundation; either |
11 | | * version 2.1 of the License, or (at your option) any later version. |
12 | | * |
13 | | * FFmpeg is distributed in the hope that it will be useful, |
14 | | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
15 | | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
16 | | * Lesser General Public License for more details. |
17 | | * |
18 | | * You should have received a copy of the GNU Lesser General Public |
19 | | * License along with FFmpeg; if not, write to the Free Software |
20 | | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
21 | | */ |
22 | | |
23 | | #include "avformat.h" |
24 | | #include "rawdec.h" |
25 | | #include "libavcodec/startcode.h" |
26 | | #include "libavutil/intreadwrite.h" |
27 | | |
28 | 549k | #define AVS2_ISSQH(x) ((x) == 0xB0) |
29 | 459k | #define AVS2_ISEND(x) ((x) == 0xB1) |
30 | 483k | #define AVS2_ISPIC(x) ((x) == 0xB3 || (x) == 0xB6) |
31 | 231k | #define AVS2_ISUNIT(x) (AVS2_ISSQH(x) || AVS2_ISEND(x) || (x) == 0xB2 || AVS2_ISPIC(x) || (x) == 0xB5 || (x) == 0xB7) |
32 | 28.7k | #define AVS2_ISPROFILE(x) ((x) == 0x20 || (x) == 0x22 || (x) == 0x30 || (x) == 0x32) |
33 | | |
34 | | static int avs2_probe(const AVProbeData *p) |
35 | 964k | { |
36 | 964k | uint32_t code = -1, hds = 0, pic = 0, seq = 0; |
37 | 964k | uint8_t state = 0; |
38 | 964k | const uint8_t *ptr = p->buf, *end = p->buf + p->buf_size, *sqb = 0; |
39 | 964k | if (AV_RB32(p->buf) != 0x1B0){ |
40 | 958k | return 0; |
41 | 958k | } |
42 | | |
43 | 241k | while (ptr < end) { |
44 | 236k | ptr = avpriv_find_start_code(ptr, end, &code); |
45 | 236k | state = code & 0xFF; |
46 | 236k | if ((code & 0xffffff00) == 0x100) { |
47 | 231k | if (AVS2_ISUNIT(state)) { |
48 | 86.4k | if (sqb && !hds) { |
49 | 4.45k | hds = ptr - sqb; |
50 | 4.45k | } |
51 | 86.4k | if (AVS2_ISSQH(state)) { |
52 | 28.7k | if (!AVS2_ISPROFILE(*ptr)) |
53 | 818 | return 0; |
54 | 27.9k | sqb = ptr; |
55 | 27.9k | seq++; |
56 | 57.7k | } else if (AVS2_ISPIC(state)) { |
57 | 32.4k | pic++; |
58 | 32.4k | } else if (AVS2_ISEND(state)) { |
59 | 506 | break; |
60 | 506 | } |
61 | 86.4k | } |
62 | 231k | } |
63 | 236k | } |
64 | 5.65k | if (seq && hds >= 21 && pic){ |
65 | 1.43k | return AVPROBE_SCORE_EXTENSION + 2; // more than cavs |
66 | 1.43k | } |
67 | | |
68 | 4.21k | return 0; |
69 | 5.65k | } |
70 | | |
71 | | FF_DEF_RAWVIDEO_DEMUXER(avs2, "raw AVS2-P2/IEEE1857.4", avs2_probe, "avs,avs2", AV_CODEC_ID_AVS2) |